Which architectures are which? I assume you mean the dec alpha allowed atomic operations on bytes... but your phrasing is a teeny bit unclear
On Sat, Aug 19, 2017 at 4:34 AM Florian Weimer <f...@deneb.enyo.de> wrote: > * Michal Terepeta: > > > On Tue, Aug 1, 2017 at 8:08 PM Carter Schonwald < > carter.schonw...@gmail.com> > > wrote: > >> One issue with packed fields is that on many architectures you can't > > quite do subword reads or > >> writes. So it might not always be a win. > > > > Could you give any examples? > > Historic DEC Alpha, now long obsolete. > > It is very hard to create compliant and performant implementations of > Java 5, C 11 or C++ 11 on such architectures. All these languages > (and their subsequent revisions) require that naturally aligned > objects can be accessed independently. For example, you can't use a > simple read-modify-write cycle to implement a single-byte store using > word operations. > > That's why such architectures really do not have a future (or even a > present), except maybe in niche markets such as GPGPU (but even there, > things are heading towards the de-facto standard memory model). >
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